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- Title
The influence of load correlation on vibration fatigue damage of symmetrical notched cantilever beam structures.
- Authors
Luo, Zhengbo; Zhou, Cheng; Fan, Xin; Wang, Yaobin; He, Guangzong; Chen, Huaihai
- Abstract
This paper aims to develop an innovative multiaxial fatigue criterion based on the stress invariant, in order to perform the fatigue damage analysis of engineering structures subjected to random vibrations. First, the change rule of structural vibration fatigue lifetime under different load correlation conditions is systemically studied by experiments. Then, the finite element analysis of such a structure, including the modal analysis and the spectral analysis, is implemented in order to compute the response stress power spectral density (PSD) functions at the critical fatigue‐prone location under coupled random acceleration base excitations. Finally, the influence rule of load correlation on the vibration fatigue damage of such a symmetrical structure is theoretically illustrated through formula derivation. Moreover, combined with the critical distance theory point method, the proposed time/frequency‐domain multiaxial fatigue criterion is applied for vibration fatigue lifetime evaluation of the structure. The lifetime prediction accuracy of the proposed multiaxial fatigue criterion is verified by comparing with the vibration fatigue test results. Highlights: A novel time‐domain multiaxial vibration fatigue analysis method is developed.A novel frequency‐domain multiaxial vibration fatigue analysis method is developed.Influence of load correlation on vibration fatigue damage is investigated.Validity of proposed method is confirmed by fatigue life prediction result.
- Subjects
FATIGUE cracks; STRUCTURAL dynamics; STRUCTURAL engineering; CRITICAL point theory; RANDOM vibration; MODAL analysis; FATIGUE life; PHYSIOLOGICAL effects of acceleration
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2023, Vol 46, Issue 12, p4760
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.14166